1/* 2 * Copyright (C) 2009 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.google.common.collect; 18 19import java.io.InvalidObjectException; 20import java.io.ObjectInputStream; 21import java.io.Serializable; 22 23/** 24 * List returned by {@link ImmutableCollection#asList} when the collection isn't 25 * an {@link ImmutableList} or an {@link ImmutableSortedSet}. 26 * 27 * @author Jared Levy 28 */ 29@SuppressWarnings("serial") 30final class ImmutableAsList<E> extends RegularImmutableList<E> { 31 private final transient ImmutableCollection<E> collection; 32 33 ImmutableAsList(Object[] array, ImmutableCollection<E> collection) { 34 super(array, 0, array.length); 35 this.collection = collection; 36 } 37 38 @Override public boolean contains(Object target) { 39 // The collection's contains() is at least as fast as RegularImmutableList's 40 // and is often faster. 41 return collection.contains(target); 42 } 43 44 /** 45 * Serialized form that leads to the same performance as the original list. 46 */ 47 static class SerializedForm implements Serializable { 48 final ImmutableCollection<?> collection; 49 SerializedForm(ImmutableCollection<?> collection) { 50 this.collection = collection; 51 } 52 Object readResolve() { 53 return collection.asList(); 54 } 55 private static final long serialVersionUID = 0; 56 } 57 58 private void readObject(ObjectInputStream stream) 59 throws InvalidObjectException { 60 throw new InvalidObjectException("Use SerializedForm"); 61 } 62 63 @Override Object writeReplace() { 64 return new SerializedForm(collection); 65 } 66} 67